# def greet_user(name):
#     """显示简单的问候语"""
#     print(f"Hello,{name.title()}!")
    
# greet_user('jesse')

# famous_person="Yu Zhengjia"
# message=f"{famous_person}，正在疯狂学习Python"
# print(message)

sum=0
for i in range(5):
    sum+=i
print(sum)